Door operating mechanism

Abstract

A mechanism for opening and shutting hinged doors, having special utility for discharge doors on silage elevators remotely operable by control ropes, which mechanism is firmly held in both open or closed position by gravity force holding the mechanism against a stop element which employ a door operating pulley, to one side of which is attached a control arm to open and close the door. The pulley is caused to rotate slightly past the point where said control arm is at its uppermost position when the door is opened and lowermost position when the door is closed and the stop means on said pulley prevents further rotation so that the door is held both open and shut by the force of gravity thereon.

What is claimed is: 
     
       1. In combination a hinged door and a mechanism for opening and closing said door comprising: (a) a door having a hinge at the top edge thereof;   (b) a pulley located above said door;   (c) a connecting rod hingedly connected on one end to said door and pivotably connected to a peripheral edge of said pulley at opposite end;   (d) stop means associated with said pulley to limit rotation thereof in both the clockwise and counterclockwise directions located so as to allow rotation of said pulley in one direction slightly past the point where said pivotable connection is at its lowermost point of travel and in the opposite direction slightly past its uppermost point of travel;   (e) an elongated flexible means wrapped around said pulley suitable for causing rotation thereof in each direction.   
     
     
       2. A device according to claim 1 wherein said door is of an L shaped configuration. 
     
     
       3. A device according to claim 1 wherein said elongated flexible means is a rope. 
     
     
       4. A device according to claim 1 wherein said rod is connected to the front face of said pulley and said stop means comprising pins extending from the rear face thereof together with a metal plate positioned to intercept one of said pins to limit clockwise travel and the other of said pins to limit counterclockwise travel. 
     
     
       5. In combination, a pair of hinged doors adapted to open and close a section of a material conveying duct and a mechanism for opening and closing said doors comprising: (a) a door hinged at the top edge thereof;   (b) a pulley located above a first door;   (c) a connecting rod hingedly connected on one end to said door and pivotably connected to a peripheral edge of said pulley at opposite end;   (d) stop means associated with said pulley to limit rotation thereof in both the clockwise and counterclockwise directions located so as to allow rotation of said pulley in one direction slightly past the point where said pivotable connection is at its lowermost point of travel and in the opposite direction slightly past its uppermost point of travel;   (e) an elongated flexible means wrapped around said pulley suitable for causing rotation thereof in each direction;   (f) said pulley being rigidly attached to a central shaft extending from the side of the pulley opposite said connecting rod, said shaft being pivotably attached at the opposite end to a second connecting rod, said pivotable connection being attached to a radially offset member which is rigidly affixed to said opposite end of said shaft and aligned with the first mentioned pivotable connection;   (g) a second door also being hinged at the top edge thereof, the end of said second connecting rod opposite said pivotable connection being hingedly connected to said second door whereby said doors are simultaneously opened and simultaneously closed by rotation of said pulley.   
     
     
       6. A device according to claim 1 wherein said door is of a curved configuration.